nelson mandela will lie in state for three days and be buried sunday. more than 60 world leaders plan to attend. president obama and the first lady left less than an hour ago. former president bush and his wife laura joined them after flying in from dallas overnight to avoid bad weather. hillary clinton is also on board air force 1. bill clinton is flying for rio where he was attending a clinton global initiative. the carters are flying in separately via a delegation that is with the elders in london. prince charles and david cameron will thereby as well as former prime ministers, tony blair, gordon brown and john major. leaders from chine a cuba, japan and mexico plan to be there too. security is a real concern and police are already running drills and shutting down streets. we haven't seen this kind of attendance since at least 1999 when dignitaries from 55 countries attended king hussein's funeral. leaders from more than 110 countries attended winston churchill's in 1965. turning now to the wicked winter weather for much of the country, air force one